MD History: Refactor how data is created in tests

chrome/test/data/webui/md_history/history_supervised_user_test.js

Index: chrome/test/data/webui/md_history/history_supervised_user_test.js
diff --git a/chrome/test/data/webui/md_history/history_supervised_user_test.js b/chrome/test/data/webui/md_history/history_supervised_user_test.js
index caa1abe1d3dd01fd14b795945175726c920f3175..a39a39ff6828a155071334c472fc08236f9d4816 100644
--- a/chrome/test/data/webui/md_history/history_supervised_user_test.js
+++ b/chrome/test/data/webui/md_history/history_supervised_user_test.js
@@ -3,20 +3,15 @@
 // found in the LICENSE file.
 
 cr.define('md_history.history_supervised_user_test', function() {
-  // Array of test history data.
-  var TEST_HISTORY_RESULTS = [
-    {
-      "dateRelativeDay": "Today - Wednesday, December 9, 2015",
-      "url": "https://www.google.com"
-    }
-  ];
-
   function registerTests() {
     suite('history-list supervised-user', function() {
       var element;
+      var TEST_HISTORY_RESULTS;
 
       suiteSetup(function() {
         element = $('history-list');
+        TEST_HISTORY_RESULTS =
+            [createHistoryEntry('2016-03-15', 'https://www.google.com')];
       });
 
       setup(function() {